Nut-lock.



No. 829,591! PATENTED AUG, 28, 1906. G. W. LBBY.

NUT LOCK.

?LIPPLGATION FILED AUG.23. 1905,

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GEORGE w. LIBBY,V or PORTLAND. MAINE.

Specification of Letters Patent. I

NUT-LOCK. `l

Patentednug. 2s, 1906.

' Application nea lingua 2s, 1905. y sain No. 275.500.

Toy all 11i/71,0712 may concern: Be it known lthat L-GEORGE W. LIBBY, a

citizen of the United States, residing at Port.

- land, in the county of Cumberland and State ofMaine, have invented an Im rovement in Nut-Locks;v and 'I hereby dec are that the following is a full, clear, and exact descrp-l f'tion' ofthe linvention, which will enable others skilled in the art to which itv appertains to make vand use the same."

AMyiinventi'on relates to improvements 1n y' nutelocks,

V`: :The object of my invention is to provide a device for locking nuts on .bolts which shall be not only simple andl effective, but also employ such means for the connection ofthe 'parts as to avoid their separation or loss.

In the drawings', Figure 1 is a side elevationo'f;V a bolt and head with the threaded portion of the bolt and nut in Vvertical longitudinal section. Fig.v2 is a top plan of the cap with a portion broken out. Fig. 3 is a top plan of the nut Fig. Litis a vertical longitudinal ysection of the nut on the line x of Fig. 3. Fig. 5 is a top plan of the nut-look. Fig. 6 isa transverse section o'f the same on Athe line y y of Fig. 5. Fig. 7 is a plan of the under side of the'nu-t and cap, and Fig. 8 is a vertical longitudinal lsection of the cap on the linezzof Fig. 7.

The bolt A shown in the drawings is of ordinary construction, having a head a., and screw-thread b at the other end. The nut'B is also of the usual construction, except that its outer circumference is lpreferably circular rather than square or many-sided. It is provided Within with a screw-thread adapted to receive the -screw-thread b of the bolt.

l Upon the side the nut is provided with a semicircular groove d. (See Figs. 1, 3, and 4.) The nutslock C consists of a spiral the finterior edge -of which, c, is made tc conform in sha e to the thread b of the bolt A. It is provi ed also 'with a semicircular groove e in the side similar to the groove d of the nut B and so placed and of such size as to register with the groove d. The ends of the nut-lock C overlap each other to the extent of about extending-nearly to the topandof nearly the same diameter as the exterior diameter of the nut B. This aperture extends to the ytop of the cap, which top is provided with an aperture slightly larger than the diameter of the nut. In one side of the interior wall is a semicircular groove f, preferably of the same diameter as the grooves d and e in the nut and nut-lock and terminating in the aperture g through the head of the cap. (See Figs. 1 and 2.) The parts being constructed as described, the cap D is heated and shrunk over f the nut B, (the groove d of the nut being placed opposite the groove f of the ca so as to form a continuous aperture whicf will register with the opening g,)' inclosing the nut-lock C between the top ofthe nut and the under side ofthe top of the cap D, thus securinvr all the partsitogether, but leaving the nut-lock C free to move independently of the other parts.

It is believed that the operation of the de I vice is obvious. It being desired to place the nut inposition upona bolt, a pin is inserted through the aperture g and through the circular aperture formed by the groove f on the one side` and the groves d and e of the nut and nut-lock on the other side and the nut then turned onto the bolt in the usual manner. The pin is now withdrawn and the nut is securely locked upon the bolt, slight motion only being permissible, not exceeding generally a quarter kof a turn' either way. The degree of such motion depends upon the amount of space -between the top and bottom of the nut-lock and the under side of the cap and the top of the nut, respectively. The y nut is thus locked upon the bolt, because if it is attempted to turn the nut olf from the bolt or by jar it works up against the nutlock the. Contact between the' upper surface of the'nut and the overlapping portions of the nut-lock presses these overla ping portions together, the more closely t'Ihe greater the force, thus causing the inner edges of the overlapping portions to grasp and bind tbe thread of the lbolt between them, which effectually prevents the turning of the nut-lock. The nut-lock being constructed of thin steel has a tendency to gras the bolt and to maintain the position in w ich it is left when the tempted toA turn off the nut or by the under farther onto the bolt, the maximum pressure attainable being obtained in about onequarter revolution of the nut in either case,

as above stated.

If it is desired to remove the nut, the cap D is turned (carrying With it the nut- B) to such an extent that the aperture gregisters with the aperture formed by the grooves f, d, and 'e, when the pin is inserted and the nut removed in the ordinary manner. In case attempt is made to forcibly remove the nut without connecting the nut and nut-lock by the pin strippingl the thread of the bolt is prevented by reason of the support a-iiorded y-'thelower end ofthe nut-lock to the upper end of the nut B, (see `Fig. 1,) the upper surface of the vnut coming in contact with the lower surface of the nut-lock.

In the event that theparts bolted together are 'desired to be closely held and Without any play the space between the top of the nut and the bottom of the head of the cap should be only slightl y greaterthan the thick.A ness of the two ends of the nut-lock.

The cap D- does not prevent the separation of the parts, but protects both nut and nutlock rominjury.

Additional or other means may be used for connecting the cap D with the nut B-as, for instance, when the cap is shrunk hot upon l the nut a lip and groove may be provided in 1. The combination of a nut and nut-lock" and an inclosing cap iixed to said nut and leaving said nutdcck normally free, together with means whereby said nut and inclosing cap and the nut-lock may be at Will connected so as to insure the movement of said parts together, substantiallyT as described.

2. The combination of a nut and nut-lock and an inclosing cap fixed to said nut and leaving said nut-lock normally free, together with registering apertures, akey adapted to enter said apertures whereby said cap and nut and said nut-lock may be so connected as to. insure the movement of said parts together, substantially as described.

In testimony that I claim the foregoing as my invention I have hereunto set my hand this th day of August, A. D. 1905.

GEORGE W. LI'BBY.

In presence of- GEO. E. BIRD, A. C. BERRY. 

